Hi,
I've found the answer in this forum... This question was previously asked. Sorry !!!!
xox
the answer :
The system periodicity (to be used with EOD
or intraday data) is set at the time the data is loaded. The test
periodicity must be set when starting from scratch (having no data
loaded). Once loaded the periodicity cannot be changed.
When selecting a new test portfolio, the Periodicity option at the bottom left of the Add Securities window will be enabled. Mark the required securities, and then select the wanted periodicity.
Once beyond this step the periodicity cannot
be changed. That applies to both the existing portfolio and when adding
more securities. All securities must be removed and the load process
started anew if a periodicity different from the default or selected
one is required. Otherwise the option will be disabled. The default
periodicity is usually the same as the underlying data
Roy